Oh, a bit of tactic and strategy are left here and there. The trouble IMO is that the clientele has changed. 10 or 15 years ago, computer and online games (even console games to some extent) were heavier on tactics and strategy, but that was a time where the vast majority of players were a bit nerdier and willing to engage with a steeper learning curve.

Today's MMOGs have such a wide target group, that the games often have to be kept as simple as possible in order to attract the more casual player who is unwilling to invest much time in learning the intricacies but simply wants to click and shoot, preferably on their smart phone or phablet. The success of all these farming games and their many clones attests to this sad condition.

We moved from chess to checkers, and games such Jane's Battle Simulators would be boutique games today, where the player who was able to calculate parabolic trajectories for artillery shells was at an advantage. 

I'm sure there are many players who would wish for a game where a smaller army could defeat a much larger one simply by employing the right tactics, but I'm afraid we would still be in a small minority compared to the many casual walk-in customers.

m2cw
P.